When I wrote "Starting A New Law Office: A Checklist" for the Texas Bar Journal in 2008, I wasn't the only lawyer writing about the technology needed to operate the law office. Sam Glover over at Lawyerist put together a catalog of the technology he used to manage his practice the same year, and then updated the list in 2010.
Earlier today I noticed that he has updated the list again with what he would use if he were starting a new solo practice. This link has a link to the full post, as well as a list of the tools, with links to reviews. it's a pretty good list – I use six of the 13 he recommends.